Cutting machine for paper, cardboard, and the like



- l l l l l I l I l I I l Q1 June 5, 1928.

STEGMANN CUTTING MACHINE FOR PAPER, CARDBOARD, AND THE LIKE Filed May 28, 1925 side of the pressing Patented June 5, 1928..

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commemonmn Application fled mm, 1925, Serial no.

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FOB rarnn, .cannn'oann, Ann ran This invention relates to a cutting machine. for paper, According to cardboard andthe like. the. invention the beam isconnected -Twith springs, w permanently "under compression,

ressing ich are so that these springs press the pressing beam against the pile, while by a ..posi-tive connection of the press lever system with the driving crank the lifting of the pressing beam is effected in further compressingthe springs.

The

positive connection is automatically disconnected when the pressing beam ing encounters reslstance.

in descend- In'order to ensure the positive connection the journal of the. longitudinal slot of edly connected with v as soon as sistance when it descends,

pressing lever engages a the connecting rod hingthe crank pin so that, the pressing beam encounters rethe connecting rod can continue to move independently of the pressing beam.

P the pressing pressing springs-between levers to this moment the elastic pressure of beam exerts at the descent a driving action upon the crank pin.

An especially favorable form of construcwhich. are

coupled so that they move in opposite directions,

said levers pressing the beam on the pile,-the pressure and counter-pressure of the same springs acting the-other side of the "same. other equivalent means,

the one on the one beam and the other on Evidently any for instance-pneu matic' pressure, might be substituted for the spring pressure.

The spring pressure according to the actual position of "this arrangement in full force sideof the pressing beam. As

the pressing beam acts in upon each the sets of driving levels between pressing springs and pressing beam comprise, in

this form of construction, onboth sides of the pressing beam the same number of hinged connections the wear and theplay due equal so that, in of known. type,

"is always ensured for both sides ting the springs arranged so that they do not coincide chine.

Thecutting under tension abl an do not overlap one another the machine is, relieved of fany pressing work.

ltO this wear will'be opposition to the machines the same pressing pressure of the maperiod and the period for putare preferand sothat during the cutting. period,

A specially 'little driving power obtained. ther advantage that the spring pressure re:

entire cuttin 33,416, and in Germany Octobcr 1a, 1924.

strong spring pressure can be obtained with the mechanism according to the invention, in a small space, if, several spiral pressing springs are telescoped one within another. Incomparison with the spring pressings on cutting machines commonly usedthe invention .presents the advantage that with an especially strong pressing and consequently an especially accurate cutting by the machine can be obtained.

.The power required for putting the springs under compression is, in this machine,'practically zero if the machine works with full cutting height of material so" that the entire power is at disposal for the "cut: ting. The work of the spring increases, therefore,.only when the height of the pile decreases, e. g. at decreasing cutting height whereby a good equalization of power is The machine possesses the-.fur-

mains uniform during the entire cutting period and, as is necessary,\increases in proportion to-the height of the pile of paper.

This spring pressure which remains uniform is produced prior to the beginning of the cutting and remains the same during the operation until the knife has again arrive above the pile. When the pile is very high the driving crank acting upon the pressing lever will, for instance, act upon this pressin lever only fora short time in order to the pressing beam a few millimeters' During the remainder of the rotation the crank pin and the. connecting rod are absolutely relieved' so that the whole driving available for driving the knife. A further advantage of this machine is that the stroke of the knife is shorter owing to the fact that the knife need not move in advance.

An embodiment of the invention is shown,

by way of example, in the only figure of the which shows someaccompanying drawing,

front. elevation of what diagrammatically a the device. a

The pull rods 2 and 3 are hingedly connected by means of bolts 4, 6 with thepre'ssing beam 1 which is suspended in the usual manner. The pull rods 2, 3 are' hingedly connected at the lower ends by means of bolts, 5 and 7 withv levers 8nd 9 pivotally mounted on axles 27 and 26. The levers 8 and 9-are rigidly connected with levers 10,

power is 16 continues to move "without exerting any pressing beam 1 is 11 respectively. The levers 10, 11 are hingedly connected'by means of bolts 14. and 15 with spring blocks between which-spiral springs 12 and 13 are clamped, said springs slot of the connecting rod 16 which is hingedly connected with the crank pin 18. When the crank pin 18 rotates from the left dead point to the right dead point the stationary stud 17 slides at first in the slot of the connecting rod 16 until it arrives at the end of this slot. From this moment the connecting rod draws the stud 17 and come quently the pressing lever 28 along whereby the entire lever system 7, 11 and-with'the sametalso the lever system 8, l0 is oscillated through the intermediary of the coupling rod 22. By this oscillating movement the lifted ofi the pa er pile.-

The paper pile is shown in the gure of the drawing at its maximum height. In this case thepressing beam is lifted only for a very short distance. The connecting rod 16 acts therefore upon the crank pin 17 *for a very short time only.. When the crank pin has passed beyond the right dead point position the stud 17 participates at first in the movement of the connecting rod 16 um til the pressing beam 1 comes in contact with the paper pile 25. From this moment the stud 17 is stationary 'and the connecting rod power;

A crank in 19 operates the knife through the interm%iiary of a pull. rod 29. This crank pin 9 is'displaced with regard to crank pin 18 in such a manner that the cutting be ins only when the period of putting the sprmgs'undertension has finished and it is terminated before the-pressing period begins.

I claim:--

1. A machine for cutting piles ofpaper,

. and tending to' claim spondlng end of the pressing jbeam, means i for connecting-said levers'iso that they move in unison in opposite directions, a resilient member interposed between sure of said resilient member each'acting on one end of said beam; through the levers, press the beam against the pile of papers, levers against the action of said resilient member to. raise'said pressing beam,

the other ends ofsaid levers, the pressure and counter presand means forrotating said 2. A machine for cutting piles of paper,

cardboard, and the. like in accordance with claim 1 in which the means for raising the pressing beam. comprises a connecting rod having a lost mot'ion connection with one of said levers, and .a crank. for reciprocating said connecting rod.

3. A machine for cutting piles of paper, cardboard, and the like in accordance with 1 in which the means for raising the pressing. beam comprises a connecting rod aving a" pin and slot connection with one of said levers and a crank for reciprocating said connectin rod and a second crank ri-gid with the rst havingai second connectlng rod pivoted'thereto ada ted to reciprocate a knife, the cutting period of the knife and the spring tensioning period being so timed that they do not overlap, whereby the machine during cutting is relieved ofpressingwork.

4. A paper cutting machine in accordance with claim 1 in which the resilient member comprises a plurality of telescoped springs.

pressing beam, a pair of levers, means for connecting one end of each lever to a correspondmg end of the pressing beam, a re- 5. A paper cutting machine comprising a s'ilient member interposed between the other 7 ends of said leverst e pressure andcounter pressure of said resilient member each actmg on one side of said beam through the levers, and tending to press the beam against the paper, and means for rotating the levers to'raise the'pressin beam from the paper,

said means influencmg the levers only dur-' ing the pressing beam raising stroke.

The foregoing" specification signed at Bautzen this 25 of April, 1925.

KARL STEGMANK, 

